Sphinx 4 Support

[Daltz333]

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[codecov]

Codecov Report

Merging #110 (3bf8111) into master (506e69f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #110   +/-   ##
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  Coverage   97.16%   97.16%           
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  Files           2        2           
  Lines         212      212           
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  Hits          206      206           
  Misses          6        6           

Flag	Coverage Δ
pytests	97.16% <ø> (ø)

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[Daltz333]

@foster999 could you take a look at the incompatibility with Sphinx 4? Feel free to push to my fork

[foster999]

Thanks for this @Daltz333

I've compared outputs between sphinx 3.5.4 and 4 (pre-release). Looks like the formatting of code-block's with line numbers has changed from:

to:

This seems to be an intentional change to improve accessibility (sphinx-doc/sphinx#7849), so I'll push a new sphinx-version-dependent test for this.

[Daltz333]

We may want to default html_codeblock_linenos_style to the old style for the user or expose with code-tab

[foster999]

Good point!

I've just tried setting the default to the old style in sphinx-tabs, but it seems like users are then unable to override this in their sphinx config.

Looking at the sphinx changelog, they're depreciating the html_codeblock_linenos_style option too. Given this, and that the new format improves accessibility, I'd be more inclined to follow their lead. We could document that users should use the sphinx option to revert the style (or stick with sphinx 3) and/or bump to a new major version to reflect that sphinx 4 causes a non-backwards compatible change?

[Daltz333]

Yeah, didn't realize they are deprecating the "table" option. I would do a major version bump for it.

[Daltz333]

I've pushed my changes, but I'm not sure how to conditionally skip the regression test

[Daltz333]

Okay, got things figured out.

Duplicated the other_assets test to include the Sphinx 4 generated output. They are conditionally skipped depending on sphinx version.

We probably shouldn't merge this until Sphinx 4 gets a stable release, that way we don't need to pin 4.0.0b1

[foster999]

Looks good to me 👍

Agree that holding on for a more stable release might be best. Sounds like it might only be the end of the month

[Daltz333]

Release is only 5 days away. I'm going to go ahead and merge it, and we can test Sphinx 4 major/minor versions in a later PR.